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How many millitres of 29.2% (w/w) aqueou...

How many millitres of 29.2% (w/w) aqueous solution of HCl of density of `1.25 gmL^(-1)` is required to prepare 200mL of 0.4 M HCl?

Text Solution

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The correct Answer is:
8
Molarity `(M_(1))` of stock concentrated solution can be calculated using following relation `M_(1)= ( x xx d xx 10)/(m_(B)) = (29.2 xx 1.25 xx 10)/(36.5)= 10`
`M_(1)V_(1)` (Concentred) `=M_(2)V_(2)` (Diluted)
`10 xx V_(1)= 0.4 xx 200`
`V_(1)= 8m`
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